Press the ON/OFF for once, the ON/OFF light (green) keeps on, it means starting the machine. Press the button again, it means closing the machine. If turn on the machine for second time , the green light gleams and it will keeps on after 3 minutes, the machine is running. It is starting the machine when the green keeps on. It is closing the machine when the green light extinguish for a long time. If the green light gleams, it means the machine is waiting to start, which means it will start automatically after 3 minutes or until finishing the defrosting procession.